Filter adapter for cameras



May 13, 1947'. G, G, LLS 2,420,379

FILTER ADAPTER FOR CAMERAS Filed Feb. 15, 1945 2 Sheets-Sheet l I gum or m/qyeJZs May 13, 1947. G. c. MILLS FILTER ADAPTER FOR CAMERAS Filed Feb. 15, 1945 2 Sheets-Sheet 2 lm/ enfar Gerald 660736 a 1/6 y W and Patented May 13, 1947 UNITED STATES ATENT OFFICE 1 Claim.

The present invention relates to a new and useful improvement in cameras and more particularly to an adapter secured to the shutter of the camera over the lens mount and in which a filter is removably carried in a position for covering the lens.

An important object of the present invention is to provide a device of this character by means of which the filter may be quickly and easily removed when desired and embodying means for locking the filter in position against accidental loss or removal.

A still further object is to provide an attachment of this character of simple and practical construction, which is efficient and reliable in use, neat and attractive in appearance, relatively inexpensive to manufacture and otherwise well adapted for the purposes for which the same is intended.

Other objects and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a perspective view of a camera showing the filter adapter positioned thereon.

Figure 2 is a fragmentary front elevational View.

Figure 3 is a side elevational view with parts broken away and shown in section.

Figure 4 is a front elevational view of the filter.

Figure 5 is a side elevational view thereof, with sides broken away and shown in section.

Figure 6 is a front elevational view of the collar forming part of the adapter and in which the filter is removably mounted.

Figure 7 is a transverse sectional view of the collar.

Figure 8 is a fragmentary enlarged perspective view illustrating the handles for the filter and locking half ring therefor, and

Figure 9 is a side elevational view of a modification.

Referring now to the drawings in detail wherein for the purpose of illustration I have disclosed a preferred embodiment of the invention. The numeral 5 designates a camera of conventional construction which includes the shutter mounting 6 and the lens mounting l.

A plate 3 is riveted or otherwise secured to the shutter mounting B and is in the form of a ring surrounding the lens mounting 'l, the plate having an externally threaded flange 9 projecting forwardly therefrom and surroundin the lens mounting.

A filter holder is provided which is formed of a pair of collars l0 connected to each other in spaced apart relation by means of a semi-circular or arcuate plate Hia secured to the collars by screws Nib, the center of the plate having an inwardly pressed rib lilo. The outer edge of each collar is internally threaded, one of the collars being threaded on the flange 9 and the other collar being adapted for threadedly receiving a sunshade of conventional construction (not shown). The upper half of the filter holder is open to form a slot H for removably receiving a filter l2 which includes a frame It extending around the edge of the filter to which a radially extending handle M is attached, the handle projecting outwardly of the slot II as shown to advantage in Figures 6 and 8 of the drawings. When placed in position between the collars ll), the filter will cover the interior of the holder and will occupy a position in front of the lens carried by the lensmount l. The filter may be removed from the holder by sliding the same outwardly as shown by the dotted lines in Figure 3 of the drawings.

The interior of the collars It! at a point diametrically opposite the slot H is formed with spaced parallel flanges I5 forming guides for the filter to provide a snug fit therefor between the collars.

The collars are also formed with internal grooves 85 in their upper portions adjacent the slot ii and the opposed edges of the collars at their lower portions are formed with shoulders lfia, as shown to advantage in Figure 7 of the drawings, and slidably mounted in the grooves is a half-ring ll adapted for closing the slot H outwardly of the frame i3 of the filter to secure the filter in position in the collar. When the I half-ring is moved into its open position at the lower portion of the holder, the half-ring is retained in position in the holder by the plate Etc. The locking half-ring E1 is provided with a radially extending handle it for manipulating the locking half-ring; and one end of the half-ring is formed with a slot [9 adapted for receiving the handle id of the filter to prevent interference of the handle 54 in completely closing the slot, both the handles M- and 58 being moved toward one side of the collar when the half-ring is moved into its locking position.

From the foregoing it will be apparent that the filter may be easily and quickly. mounted in position over the lens of the camera when desired,

and may be removed therefrom without necessitating a removal of the collar H]. In Figure 9 of the drawings one of the collars I0 is formed with an annular spring collar 20 to telescope over a lens mounting in certain types of conventional cameras.

Having thus described the invention, what I claim is:

A filter adapter for cameras comprising a pair of flat band collars spaced apart edgewise in concentric relation, a substantially semi-circular external plate connecting said collars in spaced apart relation and forming a bottom closure for said space throughout substantially one-half ofv REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,806,209 Major May 19, 1931 2,241,596 Guhl May 13, 1941 1,780,384 Green Nov. 4, 1930 2,301,401 Hennessy et al Nov. 10, 1942 2,352,844 Loebe July 4, 1944 

